* gdb.base/a1-selftest.exp (do_steps_and_nexts): New routine to

	* gdb.base/a1-selftest.exp (do_steps_and_nexts): New routine to
	encapsulate all the steps/nexts done during self test, starting
	at main, and makes them less sensitive to optimization issues.
	Add "hppa*-*-hpux*" to setup_xfail for "backtrace through
	signal handler" test.
	* gdb.threads/pthreads.exp: Only run this for native configs.
	* gdb.base/signals.exp (test_handle_all_print): Remove code that
	increased timeouts, it now makes no difference.
	* gdb.base/structs.exp (do_function_calls): Add hppa*-*-hpux9*"
	setup_xfails for "p fun5()", "p fun6()", "p fun7()", and "p fun8"
	tests.
	gdb.c++/virtfunc.exp (do_tests): Add "mips-*-irix5*" setup_xfail
	for "runto test_calls(void)" test.